Mechanochemical synthesis of mononuclear gold(<scp>i</scp>) halide complexes of diphosphine ligands with tuneable luminescent properties
Andrea Deák, Csaba Jobbágy, Attila Demeter, Ladislav Čelko, Jaroslav Cihlář, Pál Szabó, Péter Ábrányi‐Balogh, Deborah E. Crawford, David Virieux, Evelina Colacino
Abstract
-XantPhos)Cl (3) complexes exhibited either yellowish green (1) or bluish green (2) emission, whereas 3 was seemingly non-emissive in the solid state at room temperature. Blue- (2B) and bluish green (2G) luminescent concomitant solvates of 2 were obtained by recrystallization. Luminescent colour changes from blue (2B) or bluish green (2G) to yellow were observed when these forms were subjected to mechanical stimulus, while the original emission colour can be recovered in the presence of solvent vapours. Moreover, the luminescence of 2B can be reversibly altered between blue and yellow by heating/cooling-cycles. These results demonstrate the power of mechanochemistry in the rapid (4 min reaction time), efficient (up to 98% yield) and greener synthesis of luminescent and stimuli-responsive gold(I) complexes.